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TPS62007: Short circuit capability

Carlos Silva85
Expert 4915 points
Part Number: TPS62007

We have a design that uses a TPS62007DGS 3.3V buck converter.

I’ve had a look over the datasheet for the TPS62007DGS and there is no mention of output short circuit protection. Is there any risk of damage to the converter during a prolonged short circuit to ground condition?

  • 0
    TI__Mastermind 40040 points
    The Device in question has a current limit feature that will protect against short circuits applied to the output. please follow the guidelines stated in the datasheet for setting the current limit protection level and component selection.
  • 0 in reply to David Baba
    TI__Expert 4915 points

    Hi David,

    As far as I understand the current limit refers to the peak switch current.
    The datasheet doesn't mention whenever this is also applied to the synchronous rectifier, whose actual current will depend on the above as well as the supply voltage (Pin ~ Pout), therefore my question remains unanswered.

  • 0 in reply to Carlos Silva85
    TI__Guru**** 150770 points
    Hi Carlos,

    First, this is an extremely old device. Is this question about an existing design or a new design? If a new design, we have much newer, better devices. Please share your Vin, Iout, package, and feature needs so that I can recommend a suitable device.

    On the current limit, the device limits the peak current in the high-side PMOS as described in the D/S. Once this current level is reached, this FET is turned off and the low side NMOS turned on the ramp down the inductor current. The current in the low side NMOS will always be lower than the current in the high side PMOS.

    I'm not understanding what is lacking in the explanation that would affect an application. If the output is shorted, the high side PMOS current is limited to the current limit level cycle by cycle.
  • 0 in reply to Chris Glaser
    TI__Expert 4915 points
    Hi Chris,

    Thank you. The application is a 5.0 to 3.3V step down converter with Iout = 500mA.
    Since you mentioned we have newer devices, would you be able to make a recommendation on some suitable parts?
  • 0 in reply to Carlos Silva85
    TI__Guru**** 150770 points
    Yes. Take a look at TPS62237 (very small) and TPS6209733 (very efficient).